From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed Nov 03 2004 - 21:53:15 GMT-3
Mani,
You need the send-community option to any neighbor (EBGP or iBGP) that you want to enable community processing with. In this specific case you shouldn't need to send it to the EBGP neighbors, as the routes are suppressed to them anyways.
Regarding IPv6, see the link below for recommended reading. Also IEWB-RS has already been updated for IPv6 material. If you own it already you can upgrade at a discount; email sales@internetworkexpert.com for more information.
IPv6 Study Resources:
http://www.internetworkexpert.com/resources/ipv6.htm
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
24/7 Support: http://forum.internetworkexpert.com
Live Chat: http://www.internetworkexpert.com/chat/
________________________________________
From: mani poopal [mailto:mani_ccie@yahoo.com]
Sent: Wednesday, November 03, 2004 6:43 PM
To: Brian McGahan; ccielab@groupstudy.com
Subject: RE: BGP community attribute q's
Hi Brian,
Thanks for the prompt response. I never thought you can give a route-map with network command in bgp. So with your config, do we still need, (config-router)#nighbor R3/R4/R1 send community command.[or do we need this command only for ibgp or ebgp peers-I ASSUME WE HAVE TO GIVE THIS COMMAND ONLY FOR IBGP PEERS]. I will test this later. By the way, your responses are very good like your IE-work book. I recommend your work book to every one. Like a gem. Another quick question, what book you are recommending for IPv6.
thanks
Mani
Brian McGahan <bmcgahan@internetworkexpert.com> wrote:
Mani,
You are setting the community in the output engine of BGP. You
need to set it in the input engine as you originate the network, like
below:
R2:
router bgp 200
network 53.53.53.0 mask 255.255.255.0 route-map NO-EXPORT
!
route-map NO-EXPORT permit 10
set community no-export
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
24/7 Support: http://forum.internetworkexpert.com
Live Chat: http://www.internetworkexpert.com/chat/
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> mani poopal
> Sent: Wednesday, November 03, 2004 12:48 PM
> To: ccielab@groupstudy.com
> Subject: BGP community attribute q's
>
> Hi Group,
>
> I have a small question, any good answers are appreciated
>
> AS100 AS200
> AS300
> R1-----------------------------------------------R2, R3,
R4---------------
> -----------------------R5
> lo 1=53.53.53.53/24
> lo 2=63.63.6363/24
> (full mesh and R2--ebgp to
R1
> R3&R4--ebgp
to
> R5
>
> Assume you area advertising 53.53.53.53.0/24 and 63.63.63.0/24 at
> R2(connects to R1 via ebgp). The requirment says I should stop
> advertising 53.53.53.0/24 network to any other as.
> So from community attribute I thought of using no-export attribute.
> My configs:
> R2:
> router bgp 200
> neig R3&R4 remote-as 200
> neig R3&R4 route-map ABC out
> neig R3&R4 send community
> network 53&54 mask 255.255.255.0
>
> ip prefix-list setcomm 20 permit 53.53.53.0/24
>
> route-map ABC permit 10
> match ip prefix-list 20
> set community no-export
> route-map ABC permit 20
>
>
> SO WITH ABOVE CONFIGS, I THINK R3&R4 WILL NOT ADVERTISE THE
53.53.53.0/24
> NETWORK TO ANY OTHER EBGP PEERS(ANY OTHER AS). HOW CAN I TELL THE
ROUTER
> R2 (ONE OF THE LOCALLY GENERATED ROUTE) TO STOP THIS ROUTE TO
R1(ANOTHER
> DIRECTLY CONNECTED EBGP PEER). IS THERE IS ANY WAY TO USE COMMUNITY
FOR
> THIS AND WHAT ARE THE COMMANDS.
>
> thanks
>
> Mani
>
>
> B.ENG,A+,CCNA,CCNP,CCNP-VOICE, CSS1,CNA,MCSE
> (416)431 9929
> MANI_CCIE@YAHOO.COM
>
> ---------------------------------
> Do you Yahoo!?
> Check out the new Yahoo! Front Page. www.yahoo.com/a
>
>
This archive was generated by hypermail 2.1.4 : Thu Dec 02 2004 - 06:57:38 GMT-3